Malicious PDF — malware analysis report

Static analysis result for SHA-256 390567b8a72f3de2…

MALICIOUS

PDF

93.5 KB Created: 2021-08-08 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6206f91ae698ef345beec841957f1b12 SHA-1: 97a714312e4f278db3b303875f7938fa73b2b349 SHA-256: 390567b8a72f3de2beef3e4c2fc7eeb060e9a18615d9760cc4a65641598a20db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c162e5f04567b28a9ff18bdf3de959f1/xevogowoteruvoxemubulu.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/feea2bf601cbec4f422231e471049ed8/roxikakawamabinapabo.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076b743176e0---niwegipuruwufagibidumil.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/21769683436.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f594e6294d0ba2589da7c576461a7794/27967175656.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/53936113604.pdf
    • http://happyhanool.com/ckupload/files/wuruxuxawewirozinom.pdf
    • http://cartopack.com/Images/file/44751189777.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9d9b585e---56759705607.pdf
    • https://aucordechasse.fr/vosImages/73837007625.pdf
    • https://rh4-h1tapi-turbo.com/contents//files/44955325099.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a43cde9e3---fusofojoriwopuwujomowog.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0amvkcu8gn7eeja0v0lqqrul90/1723213074.pdf
    • http://mobilesamara.com/img/files/file/wexuluvewos.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8ih6vmoggtkn4bsvn2a7p24eka/miduvapiwesurikef.pdf
    • https://sofahatinh.com/upload/files/bilasanometopifowagam.pdf
    • http://jtour.vn/userfiles/file/15684912983.pdf
    • https://tramtron.vn/uploads/files/files/dijezakupimim.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/20360630926.pdf
    • http://jar-ted.pl/file/vikum.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fijozibaze.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fba47287b5b389b1973244c1b1a39734/lulululeborufabamune.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ac5110a85---85478666984.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gikenalus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+become+a+great+motivational+speaker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 16792 bytes
font_01_sfnt_off000121dc.bin
4365684cbba725c15caddd179c8662e839f66642600e2454df90cb3609dbc082
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 17192 bytes
font_02_sfnt_off00014e38.bin
23abf16f7aa4d0133f9c3ec1d05b979964880cf54970c91448bd6d57fb5acd56
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E38 11092 bytes